May 10, 2012 Update I was asked by the National Renewable Energy Laboratory to delete this shapefiles as they no longer support or distribute it.

NREL received this data from the Federal Emergency Management Agency (FEMA) sometime around 1993. It is our understanding that the data represents a schematic of transmission line connectivity. This is based on conversations with people at FEMA, utility companies, and others familiar with actual transmission routing. The data can appropriately be used to show whether there is or is not a transmission line of some stated voltage in some general area. The user should not use the data for analysis that would require actual knowledge of easement locations. This coverage is undocumented and has not been updated.

This data may come from a variety of U.S. government and self-reporting private sources. While we try to assure the accuracy of this material, we cannot promise that it is absolutely accurate. We do promise that using the map layer will be fun, entertaining or educational. Beyond this, we make no guarantee as to its suitability for any purpose. We assume no liability or responsibility for errors or inaccuracies. Please understand that you use these map layers at your own risk.

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